1st of all buddy,chill out, don't need to panic, especially when you at carrier mode.
2nd don't continue if you feel like it's waste of time/need IRL cash to progress further,(because whether youike it or not,but you need to give your time to your game,*)
3rd what is your current rep level? Also you are at a point where you can get alot more vehicles than just the 911 Carrera,eg Mustang GT,the easiest car to upgrade and Max out at 801 PR ,do the replayable event for mustang GT and get Purple parts (that's all it needs) and Max it out, Mustang is cheaper and easily can help you to get both the Viper and the ferrari 458 Italia(right ahead), don't worry even if it says it's hard(pr is orange and says hard below),it's not gonna be a problem to get it done,or Nissan GTR(dunno what final PR is but mine is at 816) that's both smooth and faster in every way (no matter what car you go for, you have to play regularly to get prints and parts of the car)
4th it is most important that you increase your rep level(if your rep is low) car series events is the best and fastest way to get it,also don't do all car series/carrier events all at once,take a look at the Daily Task menu,just keep filling the daily task requirements (that's all you need to get up to 2000 gold's within a month),you have to be smart and confident about what you do.
*I am saying that because you will be surprised to know that I have completed my whole carrier of my game without spending even a dollar on it, and I know that for sure that i am not the only one to do it, and unless you give your time to your build, it would not go the way you want(trust me I learned that lesson a while ago)
Feel free to ask any more queries you have,
